/* ============================================================
   base.css — 重置、排版、通用原子类
   ============================================================ */

*,
*::before,
*::after {
    box-sizing: border-box;
}

html,
body {
    height: 100%;
    margin: 0;
}

html {
    -webkit-text-size-adjust: 100%;
}

body {
    font-family: var(--font-sans);
    font-size: 14px;
    line-height: 1.55;
    color: var(--text);
    background: var(--bg);
    overflow: hidden;
    -webkit-font-smoothing: antialiased;
    text-rendering: optimizeLegibility;
}

h1,
h2,
h3,
h4,
p {
    margin: 0;
}

button,
input,
select,
textarea {
    font: inherit;
    color: inherit;
}

button {
    cursor: pointer;
    background: none;
    border: none;
    padding: 0;
}

ul,
ol {
    margin: 0;
    padding: 0;
    list-style: none;
}

canvas {
    display: block;
}

:focus-visible {
    outline: 2px solid var(--accent);
    outline-offset: 2px;
    border-radius: 6px;
}

::selection {
    background: var(--accent-soft);
}

/* 滚动条 */
* {
    scrollbar-width: thin;
    scrollbar-color: var(--scroll-thumb) transparent;
}

*::-webkit-scrollbar {
    width: 10px;
    height: 10px;
}

*::-webkit-scrollbar-track {
    background: transparent;
}

*::-webkit-scrollbar-thumb {
    background: var(--scroll-thumb);
    border: 3px solid transparent;
    border-radius: 999px;
    background-clip: content-box;
}

*::-webkit-scrollbar-thumb:hover {
    background: var(--scroll-thumb-hover);
    background-clip: content-box;
}

/* ---------- 通用文本 ---------- */

.u-dim {
    color: var(--text-dim);
}

.u-mute {
    color: var(--text-mute);
}

.u-mono {
    font-family: var(--font-mono);
    font-variant-numeric: tabular-nums;
}

.u-truncate {
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.u-row {
    display: flex;
    align-items: center;
    gap: 8px;
}

.u-spacer {
    flex: 1 1 auto;
}

.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0 0 0 0);
    white-space: nowrap;
    border: 0;
}

body.modal-open {
    overflow: hidden;
}